Fill in the blanks in whole numbers or fractions.
The ratio of adults to children is 7 : 9.
The ratio of girls to boys is 1 : 5.
The number of women to men is 3 : 4.
Let the number of children be 9 u.
- Number of adults = _____ u
- Number of girls = _____ u
- Number of men = _____ u
- Total number of people = _____ u
Adults |
Children |
7 u |
9 u |
Women |
Men |
Girls |
Boys |
3 |
4 |
1 |
5 |
|
47 x 7 u = 4 u |
16 x 9 u = 112 u |
|
(a)
Change ratio into units.
Girls : Boys : Children
1 : 5 : 1 + 5
1 : 5 : 6
Number of adults = 7 u
(b)
Number of children = 9 u
Fraction of the children that were girls =
16 Number of girls
=
16 x 9 u
= 1
12 u
(c)
Number of adults = 7 u
Fraction of the adults that were men =
47 Number of men
=
47 x 7 u
= 4 u
(d)
Total number of people
= 7 u + 9 u
= 16 u
Answer(s): (a) 7; (b) 1
12; (c) 4; (d) 16